V2 llmessage merge, incl. llcommon requisites.

Excluded llareslistener, as that appears to only be present for unit-testing
Excluded new SSL methods because, well, they don't work right reliably in v2 for me

indra/llmessage/llhttpnode.h

@@ -303,7 +303,7 @@ protected:
 	~LLSimpleResponse();
 
 private:
-	LLSimpleResponse() {;} // Must be accessed through LLPointer.
+    LLSimpleResponse() : mCode(0) {} // Must be accessed through LLPointer.
 };
 
 std::ostream& operator<<(std::ostream& out, const LLSimpleResponse& resp);